One factor is the element of the unknown. For example, in the story 'I heard a knock at the door. No one was there when I opened it.', not knowing who or what made the knock creates fear. It plays on our natural curiosity and fear of the unexpected.
The element of surprise. For example, 'I heard a knock on the door. It was my own reflection.' It quickly subverts expectations and creates fear.
They are effective because they create a sense of mystery and dread. Take 'I walked into my empty house. There were footprints on the floor that weren't mine.' In just two sentences, it gives you a feeling of something being wrong, of an intrusion. There's no explanation given, which makes it even scarier as your mind tries to figure out what could have happened. It's like a quick jolt to your nerves, and that's what makes them so effective at sending shivers down your spine.
Well, for one, the element of surprise. In a two - sentence horror story, the first sentence sets a mood or a scene, and the second one drops a sudden, unexpected and often terrifying revelation. For example, 'I sat down on the park bench. A hand reached out from under it and grabbed my ankle.' The first sentence is normal, but the second one catches you off - guard.
The use of atmosphere. Creating a spooky mood in just six sentences is key. Consider this: 'The moon was full. The cemetery gates creaked open. I walked among the tombstones. A cold wind blew. I saw a figure in white. It vanished when I blinked.' Here, the full moon, creaking gates, cold wind all contribute to the horror atmosphere.
The element of the unknown. In horror scariest stories, often what we don't see or understand is the most frightening. For example, in 'The Blair Witch Project', the idea that there is some unseen, malevolent force in the woods creates a sense of dread.
The brevity. It quickly sets a mood and leaves the horror to the reader's imagination. For example, 'I opened the basement door. Something cold grabbed my ankle.' Just two sentences, but it makes you wonder what that cold thing could be.
The contrast. For example, when you start with something normal like 'My neighbor always gives me strange looks' and then follow with 'Today I found out he was looking at the ghost behind me'. The normal - to - spooky shift makes it effective.
They're effective because they leave a lot to the imagination. For example, 'The old doll in the attic turned its head.' It makes you wonder what will happen next, and your mind fills in the blanks with all kinds of terrifying scenarios.
The unknown. Many of these stories rely on the fear of the unknown. Take 'The Call of Cthulhu' for instance. The idea of a great, ancient and indescribable evil lurking in the ocean depths is terrifying. We don't fully understand what Cthulhu is, and that makes it all the more frightening.
The unknown. In scariest short horror stories, often what is not shown or fully explained is what scares us the most. For example, in 'The Monkey's Paw', we don't really know how the paw works its magic, but the consequences are terrifying.